RT1710
Application Information
Start of Packet Sequence Prime (SOP')
The SOP' ordered set is defined as : two Sync-1 K-codes
followed by two Sync-3 K-codes
A DFP or UFP which does not support Structured VDMs
shall ignore any Structured
VDMs received.
A Command sequence shall be interruptible e.g. due to
the need for a message sequence using SOP Packets.
K-Code Number
1
2
3
4
K-Code in Code Table
Sync-1
Sync-1
Sync-3
Sync-3
A Cable Plug capable of SOP' Communications shall only
detect and communicate with packets starting with SOP'.
A DFP or Source needing to communicate with a Cable
Plug capable of SOP' Communications, attached between
a Port Pair will be able to communicate using both packets
starting with SOP' to communicate with the Cable Plug
and starting with SOP to communicate with its Port
Partner. The DFP or Source shall co-ordinate SOP and
SOP' Communication so as to avoid collisions.
Structured VDM
Setting the VDM Type field to 1 (Structured VDM) defines
the use of bits B14..0 in the Structured VDM Header. The
fields in the Structured VDM Header are defined in Table.
The following rules apply to the use of Structured VDM
messages :
Structured VDMs shall only be used when an Explicit
Contract is in place with the following exception :
Prior to establishing
an Explicit Contract a Source may
issue Discover Identity messages, to a Cable Plug using
SOP' Packets,
as an Initiator.
Only the DFP shall be an Initiator of Structured VDMs
except for the Attention Command that shall only be
initiated by the UFP.
Only the UFP or a Cable Plug shall be a Responder to
Structured VDMs.
Structured VDMs shall not be initiated or responded to
under any other circumstances.
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS1710-00 May 2016
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
